Product manual

Installation
3-16
Part 1105120-01
E 2013 Nordson Corporation
External Blower Lampheads
For lampheads without internal blowers, the customer must supply cooling
air through ductwork to each lamphead. The duct connection is for 6-in. ID
ducts. If you plan on using variable speed external blowers, contact
Nordson UV engineering for advice on the design of the air handling
system.
The following specifications must be maintained for all applications at all
times or the life of the lamphead will be greatly reduced with the possibility
of failure:
S Unimpeded and unrestricted flow of cooling air through the lamphead.
S Constant static pressure of 7-in. water column measured from the inside
of the lamphead to atmosphere.
S 350+25% CFM of filtered airflow through the lamphead.
It is important to size the cooling air blower to provide at least an additional
25% of cooling air measured at the duct inlet just prior to the lamphead.
Size the blower to accommodate all losses in the ducts and ensure that the
specified air flow and pressure are delivered to the lamphead.
NOTE: Recommended Flexible Duct Hose for External Lamphead cooling
air: McMaster-Carr part number 55125K26, neoprene coated 6-in ID hose.
Use worm clamps to connect the hose to the lamphead.
In many applications cooling air is provided to multiple lampheads from a
common source. In these installations it is recommended that air flow
adjustment dampers such as the Fantech IR-6 iris damper be added to the
ducting as close to the lamphead as possible, within 0.5 meters (1.6 ft), for
proper air flow balancing.
Once the system is up and running, check the pressure inside the lamphead
by pressing the LAMPHEAD − AIR PRESSURE button on the face of the
system controller. Refer to Operation for startup procedures.
Exhaust Requirements
Lamphead cooling air must be exhausted when lampheads are enclosed in
a cure chamber or when the air flow is restricted and/or captured at the
lamphead face.
When lampheads are installed in a cure chamber and the lamphead cooling
air is exhausted to the open air within the chamber you must size the
chamber exhaust system to evacuate at least 125% of the air flow into the
lampheads. You must also factor in the capacity to remove all air in the
chamber including air flow into the chamber through all openings, doors,
conveyors, and cracks. The air flow required is the sum of all the lampheads
and openings and must be at a static pressure great enough to keep a
negative pressure in the chamber.
When an AirShield Ventilation system, quartz plate, or any other device
restricts the lamphead exhaust air flow, the exhaust system must evacuate
at least 125% of the air flow into the lamphead at a static pressure that
ensures that there is an even flow or a slight negative pressure at the lamp
face.